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As for the retina - the are already much cheaper PMPs on the market with AMOLED screens (iRiver Spinn for example) that are even superior to iPhone's IPS. Of course those devices suffer on other functionality levels (lack of games, lack of AppStore ,etc), but the fact is they have better screens so it's not like IPS or AMOLED are served only for high-end devices.
Err no. I've used the Spinn as well as the Cowon S9, both using AMOLED, and the screen isn't "superior," it's "different." The black is veeery nice and colors look pretty but otherwise the resolution and font clarity are vastly inferior to the new iPod Touch's and colors are, while pretty, terribly inaccurate. Even the latest Galaxy S phone's super AMOLED display suffers from similar problems to an extent. Plus I haven't even mentioned how jerky and slow their touch operation is compared to the iPod Touch's and how limited those devices are in functionality. If you're trying to convince people by comparing the Touch to those devices, you're doing it wrong, especially since the Spinn and the S9 were rather expensive devices for what they do.